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Sep 01 04 05: 11p GHNGINEERING 5306-3108 P. <br /> ENGINEERING, INC. <br /> RCE#27011 Lie.!637901 <br /> September 1, 2004 <br /> Via Mail and Fax(916) 464-4797 <br /> Mr. Jim Barton <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT: WORKPLAN TO REDEVELOP AND ASSESS WELL MW-I: <br /> FORMER UNOCAL STATION #5098, 5606 PACIFIC AVENUE <br /> & FORMER MONTGOMERY WARDS, 5400 PACIFIC AVENUE, <br /> STOCKTON, CALIFORNIA <br /> Dear Mr. Barton: <br /> This letter is in response to Mr. Ben Heninburg's email dated August 26, 2004 regarding possible <br /> damage to MW-I at the subject site. GHH Engineering, Inc. (GHH) proposes to conduct the <br /> following tasks to determine if there was any impact to MW-1. <br /> • Swab the casing for approximately 15 feet below ground surface (bgs) <br /> to determine if any seal coat actually entered the well <br /> • Measure the total depth of the well to determine if any silting has occurred <br /> • Purge a minimum of three equivalent well volumes of groundwater from <br /> the well, and monitor pH and conductivity <br /> • Purged groundwater will be placed into Department of Transportation <br /> (DOT) approved 55-gallon drums and stored on-site prior to disposal. <br /> The purged water will be profiled and disposed of as a non-hazardous <br /> waste by a certified waste hauler. <br /> • Collect groundwater samples from MW-1. GHH and ENSR will <br /> collect split samples, which will be analyzed for TPH G and TPH MO <br /> using EPA Method 8015, and Volatile Organic Compounds using EPA <br /> Method 8260B <br /> 1.1960 Heritage Oak Place • Suite 2B •Auburn, CA. 95603 (530)886-3100 (800)877-1739 fax: (530)886-3108 <br />